Thorsten Fink's reigning champions went into the game at St Jakob-Park a point ahead of Luzern and Zurich and could now be leapfrogged by both sides tomorrow.

Thun took a sixth-minute lead as Ezequiel Scarione struck from the penalty spot and they doubled their lead in the 27th minute through Nick Proschwitz.

Scott Chipperfield pulled one back for Basle (61) but their chances of salvaging a point were dented when Ivorian Gilles Yapi Yapo was sent off six minutes later and substitute Ifet Taljevic killed off the contest with 11 minutes left.

In the day's other game, Neuchatel Xamax let slip a 3-0 lead to draw 3-3 at Bellinzona.

Raphael Nuzzolo's 48th-minute goal appeared to put them firmly in command but the hosts recovered with goals from Mauro Lustrinelli (a 63rd-minute penalty), Drissa Diarra (67) and Frank Feltscher (83).